---
kind: "section"
citation: "42 C.F.R. § 493.1264"
title: "42"
number: "493.1264"
heading: "Standard: Parasitology."
url: "https://uscodex.org/cfr/42/493.1264"
---

# §493.1264. Standard: Parasitology.

- (a) The laboratory must have available a reference collection of slides or photographs and, if available, gross specimens for identification of parasites and use these references in the laboratory for appropriate comparison with diagnostic specimens.
- (b) The laboratory must calibrate and use the calibrated ocular micrometer for determining the size of ova and parasites, if size is a critical parameter.
- (c) Each month of use, the laboratory must check permanent stains using a fecal sample control material that will demonstrate staining characteristics.
- (d) The laboratory must document all control procedures performed, as specified in this section.

## Notes

### Source

Source: 68 FR 3703, Jan. 24, 2003, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 263a, 1302, 1395x(e), 1395x(s)(3) and (s)(17).

### Source

Source: 55 FR 9576, Mar. 14, 1990, unless otherwise noted.