SNAPduo™ Beta-Tetra Test

Detects both beta-lactam and tetracycline residues at or below established maximum residue limits.

  • Two residue tests in one save you time, effort and expense.
  • Rugged and reliable.


* Availability / Distribution: Outside the U.S. and Canada


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Test details

Part numbers and sizes

99-17186 (20 tests)
99-27108 (100 tests)

Sensitivity Table


Drug European MRL SNAPduo Beta-Tetra
Chlortetracycline 100 ppb 60 ppb
Tetracycline 100 ppb 40 ppb
Oxytetracycline 100 ppb 25 ppb
Amoxicillin 4 ppb 8 ppb
Penicillin 4 ppb 2.5 ppb
Cephapirin 60 ppb 14 ppb
Cloxacillin 30 ppb 50 ppb
Ceftiofur 100 ppb 8 ppb
Ampicillin 4 ppb 6 ppb
Nafcillin 30 ppb 130 ppb
Cephalexin NA 40 ppb
Dicloxacillin 30 ppb 40 ppb
Cefazolin 50 ppb 30 ppb
Oxacillin 30 ppb 60 ppb
Cefoperazone 50 ppb 12 ppb
Cefacetrile 125 ppb 20 ppb
Cefquinome 20 ppb 40 ppb

Questions & Answers

About SNAP tests 

Note: The following questions do not apply to SNAP ST tests.

SNAP tests take less than 10 minutes to run.

Please refer to your package insert for test-specific storage requirements. Refrigerate SNAP NBL Tests at 0–7°C (32–45°F). Refrigerate all other non-ST tests at 2–8°C (36–46°F).  Tests can be kept at room temperature, 18–29°C (64–84°F), during the day of use. Remove only the number of tests to be used for the day.

No, you do not need to warm the tests prior to use; you can run the SNAP tests directly out of the refrigerator. Do not open the foil pouch until you're ready to run the test.

Before you test:

  1. Verify that the SNAP device has colored spots in the results window and activation circle.
  2. Make sure the pellet is moving freely in the bottom of the sample tube.
  3. Be sure your heater block has been preheated to a temperature within the 45°C ±5°C range.

SNAP tests must be run at 45°C ±5°C (104–122°F). The SNAP portable heater blocks have internal thermostats optimized within the range of 40–50°C. Allow 10–15 minutes for the portable heater to reach operating temperature. If you do not see any color in the block’s temperature strip, do not attempt to run the test. Contact IDEXX Technical Services if you have any questions about heater performance. Call 1-800-321-0207 or 1-207-556-4496, Monday–Friday, 8:00 a.m. to 5:00 p.m. ET; fax 1-207-556-4630; or contact us.

Yes, the SNAP test must remain on the heater block at 45°C ±5°C for the duration of the test—during the incubation time, the activation time and the color-development time.

Activation time is critical. After the initial incubation, pour the entire contents of the sample tube into the sample well of the SNAP device. Remain with the device and watch the sample flow across the results window toward the blue activation circle. When the blue activation circle begins to disappear, press the activator firmly until the device "snaps" and the activator is flush with the body of the SNAP device. Always activate (snap) the device when the edge of the circle nearest the sample begins to turn from dark blue to white. Do not let the circle completely disappear.

SNAP technical top - When to "SNAP"

SNAP test protocols


The number of SNAP tests you can run at one time depends on the type of heater block you have. With the preset portable models that IDEXX offers, you can accommodate two SNAP devices at one time.

If you're running multiple samples, set up all samples and SNAP devices on the heater, then set a timer for the incubation period. After incubation, individually pour the samples onto the sample well of each device. Watch the devices carefully as each sample may flow at a different rate. Activate each device as the individual activation circles begin to disappear. Snap the devices completely, and set a timer for the appropriate color-development time (it varies by test) after the last device has been activated. When the time period is complete, you can read the results.

We have answered the most frequently asked questions here to help you get started. When you receive your order, you will also receive detailed printed instructions that fully outline how to use your SNAP heater block and your SNAP tests. Anytime you have questions, you can call IDEXX Technical Services, 1-800-321-0207 or 1-207-556-4496, Monday–Friday, 8:00 a.m. to 5:00 p.m. ET; fax 1-207-556-4630; or contact us.

Ordering and shipping

You can place your order with our Customer Service department by calling 1-800-321-0207 or 1-207-556-4496 or 00800-727-43399 (Monday through Friday, 8:00 a.m. to 6:00 p.m. ET). Orders can also be faxed to 207-556-4630, or sent via email to [email protected].

Please contact your local IDEXX customer service for any order.

In most cases, we process orders the same day we receive them. To ensure we receive any changes as soon as possible, please call one of our customer service representatives at 1-800-321-0207 or 1-207-556-4496 or 00800-727-43399(Monday through Friday, 8:00 a.m. to 6:00 p.m. ET). You can also send a fax to IDEXX at 1-207-556-4630.

Still have questions?
IDEXX backs all tests with a dedicated team of professionals available to answer your product, regulatory and dairy-industry questions. Call IDEXX Technical Services at 1-800-321-0207 or 1-207-556-4496 or 00800-727-43399, Monday through Friday, 8:00 a.m. to 5:00p.m. ET; or complete the contact form.