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Laboratory Test Directory

Ova and Parasite Examination

Components

Name Method Department Units
Ova and Parasite Examination Standard formalin-ethyl acetate concentration and trichrome stain
Microscopy
CMI, Microbiology

Battery Members

Concentration and identification, Trichrome stain

Specimen Requirements

Reasons for Rejection

  • Rectal swab
  • Stool in diaper
  • Specimen contaminated with urine
  • Stool received in Cary-Blair medium
  • Unpreserved stool received outside of specified time frame
  • Specimen collected after barium enema
  • Use of urine preservative
  • Not received within specified time frame

Comments

If sample volume <5gm or 5mL, place entire sample in the white capped Total-fix vial or the blue capped PVA vial. Giardia / Cryptosporidium antigen (GCR) recommended as initial screening test. Consider O&P if antigen test is negative and symptoms persist or in patients with foreign travel history. Cryptosporidium not detected by O&P exam. If testing for Cystoisospora (Isospora)and/or Cyclospora order an OAP and indicate on requisition : "Process for Cystoisospora (Isospora)" or "Process for Cyclospora" or "Process for Cystoisospora (Isospora) and Cyclospora." CPA: For Cystoisospora (Isospora)and/or Cyclospora order an OAP and record under SREQ comment "Process for Cystoisospora (Isospora)" or "Process for Cyclospora" or "Process for Cystoisospora (Isospora) and Cyclospora." For Schistosoma: Urinary schistosomiasis should be considered in individuals who come from areas of endemic infections who have signs of frequent urination, dysuria, terminal haematuria, suprapubic pain, and recurrent urinary tract infections. The terminal hematuria portion( presence of blood only in the last fraction of voided urine)of the urine specimen may contain numerous eggs trapped in the mucus and pus. Peak egg excretion occurs between noon and 3 pm. All 24-h urine specimens that are more than 48 hrs. old will be rejected. Schistosoma examination should not be ordered on a stool sample, only urine. For Larvae of Parasitic Helminths (Worm) indicate on requisition : "Process for Larvae of Parasitic Helminths or Worm". CPA: For Larvae of Parasitic Helminths (Worm) order an OAP and record under SREQ comment "Process for Larvae of Parasitic Helminths (Worm)" or "Process for Worm for Identification".

CPT Code

  • 87177
  • 87209