EXHIBIT 99.1

                                 [LUMINEX LOGO]

             LUMINEX CORPORATION REPORTS 2004 SECOND QUARTER RESULTS
               YEAR TO DATE REVENUES UP OVER 70% COMPARED TO 2003


Austin, TX - July 21 /PR Newswire-FirstCall/ -- Luminex Corporation (Nasdaq:
LMNX) today announced its financial results for the quarter ended June 30, 2004.

Revenue for the second quarter of 2004 was $9.2 million, compared with $5.6
million in the second quarter of 2003. Net loss for the second quarter of 2004
was $1.1 million or $0.04 per share, compared with $1.9 million or $0.06 per
share in the second quarter of 2003. The gross margin percentage was 37% of
total revenue for the second quarter of 2004 as compared with 34% for the second
quarter of 2003.

The cash and cash equivalents balance at June 30, 2004 was $37.9 million, a
reduction of $1.6 million from the December 31, 2003 balance of $39.5 million.
Working capital increased from $45.5 million at December 31, 2003 to $46.6
million at June 30, 2004.

Revenue for the second quarter of 2004 consisted of $5.3 million from the sale
of 218 Luminex systems, $2.1 million from the sale of consumables, $705,000 of
royalties and $1.0 million of other revenues. Other revenues include training
revenue, shipping revenue, extended service contract sales, miscellaneous part
sales, amortized license fees and other special project revenue.

Year to date, total revenues are $18.5 million and net loss is $1.3 million, as
compared with $10.7 million and $2.8 million respectively for the corresponding
period in 2003.

"Our year-to-year improvement in our operating results continues to be
encouraging. Although we may continue to experience some variability in our
operating results, we remain focused on assisting our partners in
commercializing Luminex's proprietary technology. The addition of Patrick
Balthrop as our new CEO and President along with the knowledge and experience he
brings should provide for additional opportunities in the marketplace." said G.
Walter Loewenbaum, Chairman of the Board.

"Luminex partners continue to make progress in commercializing and distributing
products based on our technology. Although our revenues are flat relative to the
first quarter of this year, strong growth in system sales, consumables and
royalties relative to the comparable periods of 2003 are all indicators of the
continued success of our partners in commercializing our technology, as well as
the growing acceptance and deployment of our technology. I am excited about the
opportunities that we have and look forward to developing, implementing and
communicating the company's growth strategies and establishing Luminex as a
market leader" added Patrick Balthrop, CEO and President.

Luminex will host a conference call to discuss the results for the second
quarter of 2004 at 5:00 p.m. Eastern Daylight Time on Wednesday, July 21, 2004.
The call will be available via Web cast live at http://www.luminexcorp.com.
Simply log on to the web at the address above and access the Investor Relations
link. A replay will be available on the Company's website.





Luminex Corporation develops, manufactures and markets proprietary biological
testing technologies with applications throughout the life sciences industry.
The Company's xMAP system is an open-architecture, multi-analyte technology
platform that delivers fast, accurate and cost-effective bioassay results to
markets as diverse as pharmaceutical drug discovery, clinical diagnostics and
biomedical research, including the genomics and proteomics research markets. The
Company's xMAP technology is sold worldwide and is already in use in leading
research laboratories as well as major pharmaceutical, diagnostic and
biotechnology companies. Further information on Luminex Corporation or xMAP can
be obtained on the Internet at http://www.luminexcorp.com.

Statements made in this earnings release that express Luminex's or management's
intentions, plans, beliefs, expectations or predictions of future events are
forward-looking statements for purposes of the Private Securities Litigation
Reform Act of 1995. The words "believe," "expect," "intend," "estimate,"
"anticipate," "will", "could", "should" and similar expressions are intended to
further identify such forward-looking statements. It is important to note that
the Company's actual results or performance could differ materially from those
anticipated or projected in such forward-looking statements. Factors that could
cause Luminex's actual results or performance to differ materially include risks
and uncertainties relating to, among others, market demand and acceptance of
Luminex's products, the Company's dependence on strategic partners for
development, commercialization and distribution of products, fluctuations in
quarterly results due to a lengthy and unpredictable sales cycle, Luminex's
ability to scale manufacturing operations, potential shortages of components,
competition, the timing of regulatory approvals and any modification of the
Company's operating plan in response to its ongoing evaluation of its business,
as well as the risks discussed under the heading "Risk Factors" in Luminex's
Annual Report on Form 10-K for the year ended December 31, 2003, as filed with
the Securities and Exchange Commission. The forward-looking statements contained
herein represent the judgment of Luminex as of the date of this press release,
and Luminex expressly disclaims any intent, obligation or undertaking to release
publicly any updates or revisions to any forward-looking statements to reflect
any change in Luminex's expectations with regard thereto or any change in
events, conditions or circumstances on which any such statements are based.

Contact:  Harriss T. Currie
          Chief Financial Officer
          (512) 219-8020

                              -see attached tables-



                              LUMINEX CORPORATION
                     CONDENSED CONSOLIDATED BALANCE SHEETS
                                 (in thousands)



                                                          June 30,         December 31,
                                                            2004               2003
                                                        ------------       ------------
                                                         (unaudited)
                                                                     
                                         ASSETS

Current assets:
    Cash and cash equivalents ....................      $     37,941       $     39,480
    Accounts receivable, net .....................             5,506              5,227
    Inventory, net ...............................             7,643              5,178
    Prepaid and other ............................               920                839
                                                        ------------       ------------

    Total current assets .........................            52,010             50,724

Property and equipment, net ......................             1,462              1,657
Other ............................................               939                913
                                                        ------------       ------------

Total assets .....................................      $     54,411       $     53,294
                                                        ============       ============

                           LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
    Accounts payable and accrued liabilities .....      $      3,965       $      3,895
    Deferred revenue .............................             1,475              1,307
                                                        ------------       ------------

    Total current liabilities ....................             5,440              5,202
Deferred revenue .................................             3,089              3,257
                                                        ------------       ------------

Total liabilities ................................             8,529              8,459
                                                        ------------       ------------

Stockholders' equity:
    Common stock .................................                31                 30
    Additional paid-in capital ...................           131,489            125,169
    Deferred stock compensation ..................            (3,981)               --
    Accumulated other comprehensive loss .........               (98)               (74)
    Accumulated deficit ..........................           (81,559)           (80,290)
                                                        ------------       ------------

    Total stockholders' equity ...................            45,882             44,835
                                                        ------------       ------------

Total liabilities and stockholders' equity .......      $     54,411       $     53,294
                                                        ============       ============






                               LUMINEX CORPORATION
                 CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                    (in thousands, except per share amounts)





                                                     Three Months Ended      Six Months Ended
                                                          June 30,               June 30,
                                                    --------------------    --------------------
                                                      2004        2003        2004        2003
                                                    --------    --------    --------    --------
                                                         (unaudited)             (unaudited)
                                                                            
Revenue .........................................   $  9,171    $  5,642    $ 18,466    $ 10,744
Cost of revenue .................................      5,790       3,705      11,076       7,327
                                                    --------    --------    --------    --------
     Gross profit ...............................      3,381       1,937       7,390       3,417
Operating expenses:
     Research and development ...................        987         881       1,945       1,712
     Selling, general and administrative ........      3,611       3,051       6,908       6,556
                                                    --------    --------    --------    --------
     Total operating expenses ...................      4,598       3,932       8,853       8,268
                                                    --------    --------    --------    --------
Loss from operations ............................     (1,217)     (1,995)     (1,463)     (4,851)
     Other income, net ..........................         94          96         203         206
     Settlement of litigation ...................         --          --          --       1,840
     Income taxes ...............................         (3)         --          (9)         --
                                                    --------    --------    --------    --------
Net loss ........................................   $ (1,126)   $ (1,899)   $ (1,269)   $ (2,805)
                                                    ========    ========    ========    ========
Net loss per share, basic and diluted ...........   $  (0.04)   $  (0.06)   $  (0.04)   $  (0.09)
                                                    ========    ========    ========    ========
Shares used in computing net loss
     per share, basic and diluted ...............     30,682      29,642      30,562      29,590
                                                    ========    ========    ========    ========

EBITDA (A) ......................................   $ (1,003)   $ (1,717)   $ (1,016)   $ (4,258)
                                                    ========    ========    ========    ========


(A)  -   Management believes that EBITDA is a meaningful measurement of
         operating performance as it excludes certain charges that we believe
         are not indicative of our core operating results and therefore
         provides a useful measurement to compare our performance with our
         competitors in the biotechnology products and services industry.
         However, the calculation of EBITDA has no basis in Generally Accepted
         Accounting Principals ("GAAP"). The presentation of this non-GAAP
         information is not meant to be considered superior to, in isolation
         from or as a substitute for results prepared in accordance with GAAP.

         A reconciliation to operating loss, a corresponding measure under GAAP
         is as follows:


                                                                            
         Loss from operations                       $ (1,217)   $ (1,995)   $ (1,463)   $ (4,851)
         Add: Depreciation and Amortization              214         278         447         593
                                                    --------    --------    --------    --------
         EBITDA                                     $ (1,003)   $ (1,717)   $ (1,016)   $ (4,258)
                                                    ========    ========    ========    ========