Serum adjectives are listed in this post. Each word below can often be found in front of the noun serum in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing SERUM.
abnormal, adequate, antitoxic, baseline, blood, bloody
bovine, clear, convalescent, decreased, elevated, fetal
free, fresh, high, higher, human, immune
initial, low, lower, maternal, mean, negative
new, normal, other, patient, peak, positive
reduced, same, specific, therapeutic, total
Hope this word list had the adjective used with serum you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.