The patient presented with a six-month history of exertional dyspnea and chest tightness

which had exacerbated over the past two weeks

accompanied by an anemic appearance. Based on the clinical history

electrocardiogram

gynecological ultrasound

and laboratory findings (including complete blood count and iron studies)

the patient was diagnosed with iron-deficiency anemia

sinus tachycardia

grade 2 hypertension (very high risk)

hyperlipidemia

and uterine fibroids. During the blood grouping process

the patient’s red blood cells exhibited weakened reactivity with anti-B antibodies. Given the absence of prior blood transfusions

transplants

hematologic malignancies (such as leukemia)

or specific medication history

an ABO subgroup was suspected and subsequently confirmed as an AB subgroup through further identification. Considering that allogeneic transfusion should be approached with extreme caution in patients with ABO subgroups and that the anemia was primarily iron-deficient in nature

iron supplementation was administered. The patient remained clinically stable with no significant adverse symptoms following treatment.