Do any tests indicate a severe shellfish allergy?

Positive or Negative. A positive skin or blood test for allergy to shellfish is enough evidence to diagnose an allergy if you have a convincing history of allergic reaction to shellfish. If the history is inconclusive, a blinded food challenge can be performed to help confirm the diagnosis. If you are diagnosed with shellfish allergy, you are at risk of a life threatening reaction. There is no test for severity.
Consider. There are such tests, such as rast testing (radioallergosorbent testing).

Related Questions

What symptoms indicate a severe shellfish allergy?

Multiple symptoms. After exposure to or ingestion of shellfish, you would experience any combination of the following symptoms: shortness of breath, cough, wheeze, chest tightness, vomiting, diarrhea, hives, swelling of the lips/tongue, throat discomfort, etc. Read more...