PRESERVATIVES FOR POISONINGS
- Most common preservative for toxicological specimen is saturated solution of sodium chloride (NaCl).
- Toluene is the best preservative of urine for chemical analysis and thymol for general purpose(Al
- Sodium fluoride is added to CSF, vitreous humor and urine if alcohol estimation is required.
- Bones,nails and hair are preserved in poisoning with Arsenic , antimony, radium, thallium.
- Preservation of brain is not required in heavy metal poisoning.
Table showing preservative for different poisoning.
| 1 | poisons including, carbolic acid but excluding other acids | Saturated NaCl |
| 2 | Blood for grouping | Sodium citrate in water containing |
| 3 | Blood for Alcohol poisoning | Potassium oxalate (anticoagulant) and sodium fluoride(enzyme inhibitor |
| 4 | Blood for fluoride poisoning | Potassium oxalate and sodium nitrate (in place of sodium fluoride) |
| 5 | Blood for oxalic acid and ethylene glycol poisoning | Sodium citrate (in place of potassium oxalate) |
| 6 | Blood for carbon monoxide (CO) poisoning | Liquid parafin |
| 7 | Urine | Saturated salt/rectified spirit/thymol/sodium benzoate/ HCI |
| 8 | Tissue for histopathological examination | 10% formalin |
| 9 | Sample for uric acid (gouty tophus) | Alcohol |
| 10 | Poisoning with acids, except carbolic acid | Rectified spirit |
| 11 | Autopsy specimen for virological examination | 50% Glycerin |
Exam Important
| 1 | poisons including, carbolic acid but excluding other acids | Saturated NaCl |
| 2 | Blood for grouping | Sodium citrate in water containing |
| 3 | Blood for Alcohol poisoning | Potassium oxalate (anticoagulant) and sodium fluoride(enzyme inhibitor |
| 4 | Blood for fluoride poisoning | Potassium oxalate and sodium nitrate (in place of sodium fluoride) |
| 5 | Blood for oxalic acid and ethylene glycol poisoning | Sodium citrate (in place of potassium oxalate) |
| 6 | Blood for carbon monoxide (CO) poisoning | Liquid parafin |
| 7 | Urine | Saturated salt/rectified spirit/thymol/sodium benzoate/ HCI |
| 8 | Tissue for histopathological examination | 10% formalin |
| 9 | Sample for uric acid (gouty tophus) | Alcohol |
| 10 | Poisoning with acids, except carbolic acid | Rectified spirit |
| 11 | Autopsy specimen for virological examination | 50% Glycerin |
Don’t Forget to Solve all the previous Year Question asked on PRESERVATIVES FOR POISONINGS
