Severe right-sided flank pain and dark, scanty urine output are subjective data that support a diagnosis of renal calculi. Pain radiating to the right upper quadrant and restlessness with nausea and vomiting are also consistent with the symptoms of kidney stones.
The subjective data that supports a diagnosis of renal calculi include the severe right-sided flank pain and the dark, scanty urine output. The pain in renal calculi typically radiates from the loin to the groin region, which could correspond with the pain radiating to the right upper quadrant, as stated in the patient's symptoms.
Additionally, hematuria, which can cause urine to appear dark, is commonly associated with renal calculi. Though not specifically mentioned in the subjective data, nausea and vomiting (N/V) along with restlessness could also support the diagnosis due to the association of kidney distress with gastrointestinal symptoms.
In contrast, a history of mild flu symptoms last week and dark-colored coffee-ground emesis are less indicative of renal calculi and could suggest other health issues. It is also important to note that diagnostic imaging, like X-ray or computed tomography (CT scan), is typically used for confirming the presence of renal calculi.