血液检测显示他的铁蛋白水平偏低，这可能意味着体内铁储备不足。

The blood test showed his ___ferritin levels were low, indicating possible iron deficiency.

医生建议她做血清铁蛋白检测以评估体内的铁储备情况。

The doctor recommended a ___ferritin blood test to assess her iron levels.