Bio-Rad Unity Alternatives for QC Peer Data

A peer report is only as useful as the match behind it. Unity defines every test by six parameters: analyte, instrument or kit, reagent type, method, unit of measure and temperature. With the lab and lot numbers, these “uniquely identify your QC data in the Unity Interlaboratory Program”, says Bio-Rad's Unity Real Time guide. Its monthly report then sets your mean beside two groups for each level: the peer group and a wider method group.

The alternatives draw the line in much the same place. Technopath's peer group holds “instruments of the same type from other laboratories using the same lot of QC material and using the same method” (IAMQC Peer brochure). Randox lets you filter its peer data by lot, analyte, method, instrument and reagent supplier. Thermo's LabLink xL adds custom peer groups, so a network of labs can compare against itself as well as the world.

Bigger is not always better. A Thermo SmartNote written by Sten Westgard runs the numbers: “An increase from 10 to 15 peers will get 14.8% closer to the mean, while an increase from 50 to 100 only gets 8.4% closer” (peer group comparisons). A few dozen labs on your exact analyzer, reagent and lot can tell you more than several hundred that share only a method.

Peer data is only as current as your last submission, and there are three ways to make one. A lab with one analyzer can type results in: Unity records the initials of “the user who manually entered the data”, and Technopath accepts individual results or summary statistics (mean, SD and number of points) entered online. Randox's EDI route imports an export file from the analyzer, the laboratory information system (LIS) or middleware, after a one-time mapping. And the four control makers' programs each offer an automatic feed: UnityConnect, LabLink Auto-Connectivity, Acusera 24•7 Connect and IAMQC Transfer.

Unity's guide shows what the feed does on the bench. A hardware kit “taps the data exported from the laboratory instrument to the Laboratory Information Systems (LIS) without interrupting data flow”, and rows that cannot be matched land in a rejection log. The commonest cause is a code change: Bio-Rad reviews its analyte codelists and sends them out monthly, and a test whose setup no longer matches must be remapped before it imports again. A test parked under the code “Other” never reaches the interlaboratory report at all.

Unity's peer program runs on a monthly cycle: Bio-Rad says UnityWeb “enables participation in the monthly Unity Interlaboratory Program” and publishes a submission calendar. Technopath explains the difference plainly: a classic interlaboratory program builds its reports “at the end of the month once all data has been submitted”, while a real-time one uses everything submitted up to the moment you look (IAMQC Peer brochure). Thermo's LabLink xL and Randox's Acusera 24•7 both state that there is no submission cut-off at all.

Live data helps the bench when a control drifts on a Tuesday. The lab director cares about the monthly pack. CLIA asks the lab to “document all control procedures performed” (§ 493.1256(g)), and if your written QC procedure says the director reviews peer data each month, the signed report is the proof. Bio-Rad's sample monthly evaluation opens with the tests that “may require investigation or review”, which is the page a director actually reads. Ask every alternative for its equivalent, on your own data.

One more duty sits nearby. When the same test runs on two instruments, two methods or two sites, CLIA wants a system “that twice a year evaluates and defines the relationship between test results” (§ 493.1281(a)). Unity's Data Analysis Grid can “compare the QC results of like instruments running the same QC”. That is a useful start, but the comparison and its acceptance limits are still the lab's to write and sign. The lab QC software comparison covers the daily rule-checking side.

Every vendor on this page sells peer comparison as a way to catch a problem early, and three of them say so in PT terms: Bio-Rad says Unity “can increase confidence in proficiency surveys”, Randox that Acusera 24•7 bridges “the gap between IQC and EQA”, and Technopath that IAMQC Peer builds confidence “prior to proficiency survey events”. Bio-Rad's own workbook calls an interlaboratory program “fully complementary of any proficiency testing program”. Complementary is the right word.

Each lab “must enroll in a proficiency testing (PT) program that meets the criteria in subpart I” and is approved by HHS (§ 493.801). For a test that Subpart I does not list, CLIA asks the lab to verify accuracy “at least twice annually” (§ 493.1236(c)). The rule does not name peer data as a way to do that, so ask your accreditor or state agency before you lean on a peer report for it. The two PT programs most small labs choose between are compared in CAP vs API proficiency testing.

Peer data follows the control, not the software. Bio-Rad's guide says interlaboratory reports “are not available for non-Bio-Rad control products”. LabLink is built for Thermo's MAS controls, IAMQC Peer for Technopath's Multichem and Acusera 24•7 for Randox's Acusera range, and none of the three states peer data for another maker's lots. In practice, a new peer program means a new control contract, and the price of the two belongs on one sheet.

New controls also mean new statistics. CLIA wants a mean and SD “for each batch and lot number” (§ 493.1256(d)(10)(i)), and for an unassayed control those figures “must be established over time by the laboratory through concurrent testing” beside material that already has them ((iii)). So run the new controls alongside the last Bio-Rad lot before it expires, not after, and chart the new lot in a Levey-Jennings chart maker while its own figures build up.

Then keep the history. QC records stay for “at least 2 years” (§ 493.1105(a)(3)), and Bio-Rad's sample report notes that its peer group statistics “may not be used without the expressed written consent of Bio-Rad”. Export your own lab's results and keep the signed monthly reports as they are, rather than copying peer figures into the new program.