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Test Code M68 Giardia Cryptosporidium Screen (IFA)

Important Note

Cryptosporidium can not be detected or confirmed in an Ova and Parasite exam. If Cryptosporidium is suspected order the Giardia Cryptosporidium Screen separately. 

Biohazard Infectious

Additional Codes


PowerChart: Smear Giardia Cryptosporidium Detection

Epic: LAB1319 Giardia/Cryptosporidum Antigens

MA Cerner: Giardia/Crypto IFA.

Test Method

Direct Immunofluorescence; Merifluor

Specimen Requirement

Stool collected in ParaPak collection kit.

Additional Specimen Collection Information

Parapak collection kit: 2 vials containing preservatives; one pink-capped and one blue-capped. Check expiration date on kit prior to use. Do not use expired collection kits.

  1. Pass the stool into a clean, dry container or bedpan.
  2. Do not allow urine to contaminate specimen in the collection container.
  3. Open one of the vials containing liquid.
  4. Use the collection spoon built into the lid of the vial to place a small scoopful of stool from areas that appear bloody, slimy or watery into the vial until the liquid level rises to the red line.
  5. If the stool is formed [hard], sample small amounts from each end and the middle.
  6. Mix the contents of the vial with the spoon, twist the cap tightly closed and shake the vial vigorously until the contents are well mixed.
  7. Repeat instructions for the second collection vial.
  8. Complete the labeling information on each vial.
  9. Also check the box on the label, which best describes the consistency of the specimen when collected [formed, loose, soft, watery].
  10. Place the two vials in the plastic bag the tubes came in and seal the bag.
  11. Return the collection kit to the laboratory.


Performed Monday through Saturday.

Typically completed within 24 hours after the specimen arrives at the testing site.

Reference Values

Negative for Cryptosporidium and Giardia

Positive results are called to the nurse's station or physician office.

CPT Code Information

87269 Fluorescence Microscopy by Organism: Infectious agent antigen detection by immunofluorescence technique; giardia

87272 Fluorescence Microscopy by Organism: Infectious agent antigen detection by immunofluorescence technique; cryptosporidium

Useful For

Detection of Cryptosporidium and Giardia parasites in clinical specimens.

LOINC Code Information

48061-6  Giardia lamblia+Cryptosporidium sp Ag [Presence] In Stool By Immunofluorescence