Formalin Information and Courses from MediaLab, Inc.
These are the MediaLab courses that cover Formalin and links to relevant pages within the course.
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| False Negative Urobilinogen Result Due to the instability of urobilinogen, a false negative result may occur using a dipstick method if the urine specimen has remained at room temperature for an extended period of time in the light. A false negative result may also occur if formalin is present. | View Page |
| What is Formaldehyde? Formaldehyde solution is a colorless, aqueous solution containing not less than 37% of formaldehyde or CH2O. It is usually supplied in 55 gallon drums.Formalin is a 10% formaldehyde solution that is commonly used in the laboratory. | View Page |
| Warning Signs Areas where formalin is used must have warning signs.Access to these areas is limited to authorized persons trained to recognize the hazards of formaldehyde. | View Page |
| Diluting a specimen for counting on a hemacytometer Following liquefaction (20-30 minutes), mix the sample manually by swirling the container several times. Thorough mixing is essential for accurate counting. Calibrated automatic pipettes are used to prepare a dilution. Because of the viscosity of semen, the semen should be added to the diluent using a positive pressure pipettor.
The dilution often used for routine sperm counts is 1:20 but the actual dilution factor will vary depending on the total sperm count. For high concentration specimens a greater dilution will be necessary. For low concentrations an undiluted or minimally diluted specimen may be required. The appropriate dilution is determined by estimating the concentration needed to do a count of at least 100 cells per side of the loaded hemacytometer.
The diluent that may be used for sperm counts on a hemacytometer can be as follows: 5 gm of sodium bicarbonate in 100 ml of distilled water, plus 1ml of formalin (neutral). | View Page |