A member asked:

Female 38 rast blood test result level 3 high- ige:17 iu/ml (3.5 -17.5iu/ml)a delayed rash 2 days after finished course flucloxicillin.allergy consultant"no need for drug challenge"but concerned may be a false positive, had penicillin in past,advice?

Q: female 38 rast blood test result level 3 high- ige:17 iu/ml (3.5 -17.5iu/ml)a delayed rash 2 days after finished course flucloxicillin.allergy consultant"no need for drug challenge"but concerned may be a false positive, had penicillin in past,advice?

: The CAP or RAST test is elevated and given the rash after exposure to the antibiotic, consider avoidance if possible. The rash also may have been a viral rash. Watch for signs of shortness of breath, wheezing and swelling. Repeat testing in a few months is recommended.

A doctor has provided 1 answer

Dr. Amrita Dosanjh answered

Specializes in Pediatric Allergy and Asthma

The CAP or RAST test is elevated and given the rash after exposure to the antibiotic, consider avoidance if possible. The rash also may have been a viral rash. Watch for signs of shortness of breath, wheezing and swelling. Repeat testing in a few months is recommended.

Answered 3/4/2022

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A member asked:

Female 38 rast blood test result level 3 high- ige:17 iu/ml (3.5 -17.5iu/ml)a delayed rash 2 days after finished course flucloxicillin.allergy consultant"no need for drug challenge"but concerned may be a false positive, had penicillin in past,advice?

A doctor has provided 1 answer

Dr. Amrita Dosanjh answered

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