Introduction Outbreak of corona virus disease in 2019 (COVID‐19) has resulted in significant morbidity and mortality worldwide. Our aim is to document hematological parameters of patients with COVID‐19 during initial stage of diagnosis and to identify early hematological indicators of severe infection. Materials and methods This retrospective study was conducted at Shifa International Hospital, Pakistan from April to November 2020. Patients hospitalized with COVID‐19, diagnosed on RT‐PCR and had a complete blood count (CBC) done within 48 hours of diagnosis were included. Data was analyzed using IBM® SPSS Statistics. Results A total of 425 patients were included in this study out of whom 272(64%) were males. The mean age was 55.61 ± 17.84 years. 95 patients (22.4%) had normal blood counts within 48 hours of COVID‐19 diagnosis. Cytopenias were seen in 193(45.4%) patients. There were 75(17.6%) mortalities during the study period. Chi‐square test showed that thrombocytopenia, lymphopenia and neutrophilic leucocytosis were significantly associated with mortality (P = .037, P < .001, P < .001 respectively) and need for ventilator (P = .009, P < .001, P < .001, respectively). Neutrophilia was also associated with development of Acute Respiratory Distress Syndrome (P < .001). On ROC analysis, Neutrophil‐to‐Lymphocyte Ratio yielded an area under the curve (AUC) of 0.693 and 0.660 for the outcomes mortality and need for ventilator, respectively. For a subset of 288 patients who had D‐dimer levels checked within 48 hours of COVID‐19 diagnosis, the AUC for mortality and ventilator need was 0.708 and 0.671, respectively. Conclusion Hematological indices are vital indicators in the prognosis and risk stratification of COVID‐19 during initial stages of disease.

Clear cell renal cell carcinoma (RCC) is the most frequently reported renal cell neoplasm, which commonly metastasizes to the lungs, bones, lymph nodes, liver, adrenal gland and/or brain. It is usually diagnosed as an incidental finding on radiological imaging, which can further be confirmed by histological examination of the neoplastic tissue. Bone marrow metastasis of renal cell tumors is a rare event and very few cases have been reported. Here we report an unusual case of a 68-year-male who presented with lytic bone lesions on imaging. This raised the suspicion of a bone marrow involvement by a hematolymphoid malignancy or metastatic disease and a bone marrow biopsy was performed. Incidentally, the biopsy revealed infiltration of bone marrow by clear cell RCC. The patient was referred to the oncology clinic where further workup was done which revealed a primary renal tumor.

Bombay blood group or Oh phenotype is a rare autosomal recessive phenotype within the ABO blood grouping system. It occurs due to a mutation in the H gene that produces H antigen on red blood cells (RBCs). Individuals with two mutant H genes lack H antigen on RBCs and have anti-H antibodies in serum. At the time of blood grouping, this blood group mimics O blood group but it shows incompatibility with O group blood during cross matching. Several studies have reported an association of decreased von Willebrand factor (VWF) levels in plasma with ABO blood groups. Here we report a case of a 19-year-old male, who was labelled as Bombay phenotype and later found to have markedly reduced plasma VWF levels.

Chronic lymphoproliferative disorders are a diverse group of diseases derived from thymus lymphocytes (T cells), bursa of Fabricius cells (B cells), or natural killer (NK) cells. The diagnosis of chronic lymphoproliferative disorders of NK cells (CLPD-NK) is confirmed using antibody panels that are able to detect various stages of maturation of malignant cells. Autoimmune diseases and viral infections are often associated with an increase in circulating NK cells. It is hypothesized that certain viruses trigger the activation of NK cells which leads to the formation of NK cell clones. Majority of the cases are asymptomatic. However, some patients have systemic symptoms and cytopenias. Here, we report a case of CLPD-NK. Our patient's history and marked lymphocytosis on peripheral film raised the suspicion of a hematolymphoid malignancy for which flow cytometric analysis was done using an extensive panel which confirmed the diagnosis of CLPD-NK.

Heparin is commonly used in many clinical scenarios, including venous thromboembolism, acute coronary syndromes, atrial fibrillation, orthopedic surgeries, dialysis, during extracorporeal circulation and peripheral occlusive disease.1 A life-threatening complication following heparin therapy is heparin-induced thrombocytopenia (HIT). Generally, there are two types of HIT. Type 1 HIT is a mild and non-immune disorder that presents early, usually in the first 48 hours after exposure to heparin. It is caused by an interaction between heparin and platelets leading to the formation of platelet aggregates.1,2 Type 2 HIT is an immune-mediated condition which occurs 4-14 days after exposure and sometimes has life-threatening complications.2 HIT has many different manifestations, so it is important to be cautious in a patient who is on heparin for any reason. Here, we are reporting a case of an elderly lady presented with frank hematuria (a rare presentation) later diagnosed as HIT and ultimately had extensive renal vein thrombosis which led to end-organ damage