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i-STAT blood gases
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IgE
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Immunoglobulins
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Impetigo - see Swabs - skin, superficial wounds
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Infective endocarditis - see blood cultures
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Influenza A, B and RSV (respiratory syncytial virus)
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INR
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Insulin
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Insulin-like growth factor 1
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Intra-uterine contraceptive device (IUCD)
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Intrinsic Factor Antibody
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Iron
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Islet cell Antibody
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Itraconoazole (pre, post or random)