What is the Milk Doctor?
Milk Doctor is a portable digital reader
for the antibiotic residue test in milk.
After treating the cow with antibiotics, it is necessary to check if the milk is free of antibiotic residues before leaving your farm. With Milk Doctor, it only takes 5 minutes to test the milk and get accurate results. Made in Japan with cutting-edge technology, Milk Doctor is the most effective way to protect your business.
Lightweight and handy
Milk Doctor only weights 250 grams (0.55 lbs) and can be held with just one hand. You can take Milk Doctor along with you and test the milk whenever needed. It's the perfect device for testing your bulk tank for antibiotic residues before shipping your load.
Fast and easy to use
With simple, easy to use buttons, Milk Doctor allows you to test your milk in a few steps. In five minutes you collect the milk sample, test it and verify the results with high accuracy.
Precise and reliable
Milk Doctor has a laser scanner that screens the test strips within a few seconds. Its internal memory stores up to 99 tests.
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Why should you buy the Milk Doctor?
Milk Doctor detects antibiotic residues in raw milk, protecting your business from financial risk and your reputation from getting damaged.
The presence of antibiotics in milk poses several problems to the public health and damages to the industry. The ingestion of milk contaminated with antibiotic residues can generate allergic reactions such as hives, dermatitis, rhinitis and bronchial asthma. In addition, some antibiotics have carcinogenic potential, or may lead to the appearance of tumors or hematological abnormalities.

In industry, the milk contaminated with antibiotics can inhibit the growth of dairy cultures, affecting the production of yogurt and other fermented products. Moreover, it can generate the formation of unpleasant odors in cheeses and creams.

In the United States, the Food and Drug Administration (FDA) closely controls milk production through a management system called HACCP (Hazard Analysis and Critical Control Points), establishing severe penalties and fines for the farmers whose milk is contaminated with antibiotics. In addition to the financial loss, other consequences to dairy farmers include the reputation damage and the risk of losing their license to produce milk.

Therefore, it is crucial to test the milk before sending it to the dairy, to make sure that it is not contaminated with antibiotics. The Milk Doctor is the only portable device on the market that detects antibiotic residues in milk with high accuracy, providing reliable results.
Learn why the Milk Doctor is the best solution for testing antibiotics in milk.
There are several methods on the market today for detecting antibiotic residues in milk. The more accurate ones are based on laboratory techniques such as the chromatography and rely on sophisticated equipment. But they are quite expensive and time consuming.

There are also commercial test kits, which are based on the inhibition of bacterial growth or immunological or enzymatic reactions. These kits have the advantage of being fast, but may have false-positive results, identifying residues in milk samples that actually are not contaminated. This is due to the presence of certain substances in the milk of cows with mastitis, which may interfere with the results.

The detection method of the Milk Doctor is based on the chromatography, the same as the laboratory tests. The advantage is that the Milk Doctor can be used on-site, eliminating the need of taking the samples to a lab. In addition, you can use the Milk Doctor as many times you want (which would be unfeasible with the laboratory method). This is why the Milk Doctor is the best solution in antibiotics tests: it combines the accuracy and reliability of the laboratory tests with the convenience of the commercial test kits.

Check the table below to compare the Milk Doctor with the commercial kits.
Commercial kits Milk Doctor
Product image
Measurement method Inhibition of bacterial growth Chromatography
Are the results reliable?
Is the interpretation of data done by computer, with decimal precision?
Can it be used in an environment with low visibility?
Does it have a digital display?
Does it have easy viewing buttons? ---
Does it have low power consumption (less than 1mA)? ---
How the Milk Doctor works
The Milk Doctor is a handheld device that has a laser scanner which accurately measures the results obtained by the antibiotic test kits Milk Doctor BETA and TETRA (sold separately). The results are displayed on the digital display, eliminating any doubt in the visual interpretation of the test strips.

The Milk Doctor has two test kits that detect different groups of antibiotics: Milk Doctor BETA, for beta-lactam antibiotics, and Milk Doctor TETRA for antibiotics of the tetracycline group. See the details below:

Milk Doctor
Milk Doctor
Antibiotics detected Penicillin 3ppb
Cefazolin 3ppb
Nafcillin 5ppb
Cefuroxime 5ppb
Dicloxacillin 20ppb
Ceftiofur 5ppb
Cephalonium 3ppb
Cefapirin 20ppb
Cloxacillin 4ppb
Cefquinome 20ppb
Tetracycline 20ppb
Chlortetracycline 100ppb
Oxytetracycline 20ppb
Quantity of test strips 100 100
Quantity of sampling cups 100 100
Quantity of eyedroppers 100 100
Note: sensitivity measured in ppb = parts per billion
How to use the Milk Doctor
In about five minutes, you test the presence of antibiotic residues in milk and verifies the results with Milk Doctor. See how simple it is.
1. Collect a sample of milk with the eyedropper, filling it up to the indicated level and place it in the sampling cup. Repeat the procedure.
2. Shake the plastic cup gently to spread the milk. The milk should cover the entire bottom of the cup.
3. Place the test strip in the milk sample, according to the figure. The side of the strip dedicated to the collection of the sample should touch the bottom edge of the cup. Wait for five minutes.
4. Place the strip on the scanner surface of the Milk Doctor, with the printed side down. The side for sample collection should be facing left. Close the scanner lid.
5. Turn on the Milk Doctor, pressing the "ON/OFF" button. Then press the "TEST" button.
6. The result will be displayed in a few seconds.
How the results are displayed
See how the results are displayed in the Milk Doctor BETA test kit.
The test strip has two sides: the one with the black circles is the grip. which you should hold with your fingers. The opposite side has a black stripe with two arrows. This side must be used to collect the milk sample. See the figure below:
Sampling area
Test result area
Grip area
After testing the milk sample, the strip may show the following results:
If the strip clearly displays three vertical bars, then the milk is normal.

If the milk is contaminated, the strip will not show the three bars clearly. It will display only two bars, or three bars in a faded color.
If the strip does not show any vertical bar, then the result is invalid. Do the test again to confirm.
The following section describes how the measurements obtained are displayed on the Milk Doctor.
Although it is possible to view the test results directly on the strip, interpreting them may not be an easy task.
With the Milk Doctor, the result is always accurate, with no margin for doubts. It displays the measurement of each individual stripe and also the final result. See the figure below:
A) Stripe A result
B) Stripe B result
C) Stripe C result
D) Mode ("Check" or "Data")
E) Test number
F) Final result (P for Positive and N for Negative)
When the item F of the display shows the letter N and a numeric value up to 20, the result is negative. The milk is not contaminated with antibiotics (detected by the specific kit).
When the item F of the display shows the letter P and a numeric value equal to or greater than 21, the result is positive. In other words, the milk is contaminated with antibiotics (detected by the specific kit).
  • Please perform both tests (Milk Doctor BETA test and Milk Doctor test) on a flat surface.
  • Avoid touching, wetting or soiling the test result area of the strip. If there is water or fingerprints in this area, the test result will not be correct.
  • Avoid touching, wetting or soiling the surface of the scanner, as this can affect the measurement result.
  • After using the test strip, please immediately place it on the Milk Doctor (within 30 minutes).
  • The Milk Doctor is for monitoring purposes only. The final diagnosis must be made by the official methods.
  • The Milk Doctor must be used exclusively with the kits Milk Doctor BETA and Milk Doctor TETRA. Do not use the Milk Doctor with test kits from other manufacturers.
  • The Milk Doctor cannot be used for measuring individual milk (from a single animal).
  • For more information, read the instruction manual of the Milk Doctor.
Maintenance and care
  1. Do not touch the scanner with hard or sharp objects.
  2. Do not use chemicals (solvents, thinner, etc.) to clean the device.
  3. To clean the device, use a cloth dampened with water. Then wipe it with a dry soft cloth.
  4. Avoid using rags to clean the scanner because they may scratch its surface and compromise the measurement. Wipe it gently with a cotton swab.
  5. Do not expose to direct sunlight, temperatures above 50°C (122°F), moisture or dust .
  6. The device is not waterproof. Do not soak or immerse it in water or any other liquid.
  7. Do not drop or bump the device.
  8. Always keep the scanner lid closed. Avoid exposing the scanner to light unnecessarily.
  9. Do not disassemble nor attempt to repair the device by yourself. If necessary, contact your dealer.
  10. When storing the device for a long period of time, close the scanner lid firmly, remove the batteries and keep the battery compartment closed. Store in a dry place, free of dust, moisture or sunlight exposure.
  11. When the batteries are low, a warning message appears on the display. You can still use the device, but we recommend replacing the batteries as soon as possible. To preerve battery power, the device automatically turns off after 4 minutes of no use.
Technical specifications
Measurement method Chromatography
Laser Wavelength
Auto power off 4 minutes after measurement
Battery life Approximately 500 tests
Temperature range for use 0 to 40°C (32 to 104°F)
Power 2 AA batteries (not included)
Dimensions 89 (width) x 33 (height) x 147mm (length)
Net weight 250g