The One Percent Chance
It wasn't a severe bruise, not the kind you'd get from a major injury. Just a faint, blurry mark, like the sort you get from bumping into the corner of a piece of furniture. A trivial trace that anyone would normally overlook. But today, of all days, that bruise clawed at my nerves. Before I knew it, I stopped in my tracks and poked my head through the curtain.
"Excuse me," I said. At the sound of my voice, both the nurse and the patient looked up at me. "I noticed you have a bit of a bruise on your arm. Did you bump it somewhere?"
The patient looked down at her arm, her expression suggesting she hadn't even realized the bruise was there. "Oh? You're right. When did that get there...?" She furrowed her brow, searching her memory. "Maybe I bumped into my desk while wrapping up work yesterday... I don't really remember..."
Her answer was vague. It was hard to tell if she truly couldn't remember or if she simply didn't care. But that uncertainty left a tiny, unsettling spark of doubt in my mind. I couldn't explain why. It just... felt off.
A young woman exhausted from pulling consecutive all-nighters. A throbbing migraine. And a bruise she couldn't account for. Taken individually, they were incredibly common, unremarkable symptoms and signs.
...Should I just let it go?
Ninety-nine times out of a hundred, this would be absolutely nothing. But there was still that remaining one percent. And an ER doctor is someone who must always stake everything on that one percent chance. I hesitated for a moment.
...Something feels off.
Ultimately, I decided to trust the inexplicable anxiety gnawing at my gut. I turned to the nurse. "Nurse, I'm sorry, but let's draw some blood before we give the injection. Please add a CBC (complete blood count) to the order. And let's hold off on the ketorolac for a moment."
The nurse's eyes widened slightly at my sudden order, but she quickly nodded. The patient had a look on her face that said, *A blood test, really?* but she obediently offered her arm anyway. Leaving them to it, I walked back to the station.
Yeah. It's probably nothing. I'm just being overly sensitive. I wondered if this was some lingering aftereffect of that crazy incident. Soothing my own nerves, I turned my focus back to the mountain of work waiting for me.
Time ticked by, and my thoughts of the young designer faded into the background noise of the chaotic emergency room. About forty minutes later, an intern approached me holding a stack of charts.
"Doctor, the lab results for the twenty-eight-year-old headache patient in Bed 9 of Zone B are back..." The intern's voice sounded strained. "Everything else is normal, but her platelets are... 38,000."
My fingers froze over the keyboard. I slowly raised my head. "What?"
"Her platelet count is 38,000. Normal range starts at 150,000... Could it be a lab error? Maybe the sample was contaminated, or there was a machine glitch. Should we run a retest?"
The intern's suggestion was reasonable. A count this absurdly low was usually the result of a laboratory error. I sucked in a sharp breath. Forcing myself to remain calm, I looked at the intern.
"Yeah, run it again. The sample must have been compromised. Draw a fresh sample in a new tube, and this time, hand-deliver it to the lab yourself to confirm." My voice was eerily calm. But a cold bead of sweat was trickling down my spine. *Please. Please let it be a lab error.*
I stared blankly at the space where the intern had just been standing. 38,000. The number swirled ominously in my head. Retreating to a corner of the station, I leaned my head against the wall and began to think.
Calm down. Let's think. The patient was a twenty-eight-year-old female. Chief complaint: headache. A migraine, she had claimed. I had agreed with her. But her platelet count was 38,000. Did migraines eat platelets? *Fuck no, that's impossible.* Which meant my initial diagnosis was wrong. This headache wasn't just a simple migraine.
What were the possibilities, then? The list of differential diagnoses I had memorized back in medical school flashed through my mind like a panorama. Causes of thrombocytopenia.
First, the most terrifying possibility: a hematologic malignancy like leukemia. A case where cancer cells invade the bone marrow, preventing the production of normal blood cells. However, the patient's other blood counts were normal—both white blood cells and red blood cells. Could I temporarily rule out cancer, or at least push it down the list?
What next? Medication. Certain drugs could destroy platelets. But she had said she wasn't taking any medication. Her medical history was completely clean. Liver cirrhosis or splenomegaly? A failing liver or an enlarged spleen could destroy platelets. But in a young woman? And with absolutely no other symptoms? Highly unlikely.
That left... an autoimmune disease. A faint possibility flickered in my mind. A condition where the immune system malfunctions, mistaking its own platelets for enemies and launching an all-out attack to destroy them. A disease that causes an isolated, precipitous drop in platelet count. Idiopathic Thrombocytopenic Purpura, or ITP.
It felt as though all the puzzle pieces were finally clicking into place. Yes, as of right now, this was the most logical suspicion. I couldn't keep agonizing over this alone. I looked around the room. Fortunately, Choi Sumin, the Chief Resident, had just finished charting another patient.
I approached her and reported in the calmest voice I could muster. "Dr. Choi. I have a report regarding the twenty-eight-year-old female headache patient in Bed 9 of Zone B."
"Oh, the migraine patient? Is she still in pain even after the meds?"
"No, it's not that... I noticed some bruising on her arm, so I ordered a CBC just in case. Her platelet count came back at 38,000. I've already ordered a retest."
Choi Sumin's expression hardened instantly. She grabbed the mouse and pulled up the patient's chart. "38,000? What about her other counts?"
"White blood cells and hemoglobin are both completely normal."
"Hmm..." Choi Sumin rested her chin in her hand, staring intently at the monitor. The same list of differential diagnoses was undoubtedly running through her mind.
"Dr. Choi, since there are no other abnormal findings, I think ITP is the most likely suspect."
Choi Sumin nodded at my cautious assessment. "I agree. It's too textbook to be anything else. Let's wait for the retest results first. If it comes back the same..."
Before long, the intern came running back, looking like he was on the verge of tears. He held a freshly printed, warm sheet of paper in his hand. "Doctor, the retest results are in... It's 35,000."
The moment of truth had arrived. It wasn't a lab error. Choi Sumin took the paper and let out a heavy sigh. "Sigh... Hyunjae. Go explain it to the patient yourself. Tell her she needs to be admitted."
"What? Me?"
"Yes. You're the one who caught it. Go explain it calmly and clearly so she can understand."
I swallowed hard. I had to go tell a patient who just wanted a quick painkiller before heading home that she was suspected of having a serious autoimmune disease and needed to be hospitalized immediately for further testing. Dragging my heavy feet, I walked back toward her bed.
When I pulled back the curtain, the patient was looking at her smartphone while her IV dripped. I pulled up a chair next to the bed and sat down.
"Excuse me. I have something to discuss with you. It might come as a shock, but please try to stay calm and listen. It seems your headache isn't the simple migraine we initially thought it was."
I began to explain, speaking slowly and choosing the simplest terms possible. "Have you ever heard of platelets?"
"Platelets?"
"They are crucial cells in our body. When you get hurt and start bleeding, they are the first to rush to the scene to plug the wound and stop the bleeding. You can think of them as our body's emergency repair crew."
I took a brief breath. "A healthy person normally has between 150,000 to 400,000 platelets in their blood. However, your blood test showed that your platelet count is currently at 38,000."
The patient's eyes widened. "What? Is that really low?"
"Yes. It is dangerously low. Because you don't have enough platelets to seal them, your blood vessels can rupture easily from even the slightest impact, which is why you bruise so easily."
"But why would I..."
"The condition we strongly suspect right now is called Idiopathic Thrombocytopenic Purpura, or ITP for short."
I used an analogy to help her understand. "It sounds complicated, but let me break it down. Normally, our immune system is only supposed to attack harmful bacteria or viruses from the outside. But sometimes, the immune system malfunctions and mistakes our own healthy cells for enemies, attacking them instead. We call this an autoimmune disease. In your case, it seems your immune system is misidentifying your own platelets as threats and constantly destroying them."
As my explanation went on, the color drained from her face, leaving her pale.
"It's not immediately life-threatening, so please don't panic. However, having a platelet count this low can lead to very dangerous situations. For instance, if even a tiny blood vessel in your brain were to rupture, it could lead to a cerebral hemorrhage. We can't entirely rule out the possibility that the headache you're experiencing right now is a warning sign of that."
Her pupils trembled with fear.
"Therefore, you cannot go home today," I said firmly. "You need to be admitted immediately. You must stay at our hospital to undergo further detailed testing to confirm if this is indeed ITP or if there is another underlying cause. At the same time, we need to start treatment to calm your immune system down so it stops destroying your platelets."
My explanation was complete. The patient said nothing, staring blankly into space.