*

 After an examination of the briefs and the record, we have concluded that oral

argument is unnecessary. Thus, the appeal is submitted on the briefs and the record.

See Fed. R. App. P. 34(a)(2).

United States Court of Appeals

For the Seventh Circuit

Chicago, Illinois 60604

Submitted June 9, 2005*

Decided June 10, 2005

Before

Hon. RICHARD A. POSNER, Circuit Judge

 Hon. JOHN L. COFFEY, Circuit Judge

 Hon. ANN CLAIRE WILLIAMS, Circuit Judge

No. 04-2271

CALVIN A. PICKETT, JR.,

Plaintiff-Appellant,

v.

JUDSON CHILDS, Asst. Warden,

et al.,

Defendants-Appellees.

Appeal from the United States

District Court for the Southern

District of Illinois

No. 00-429-CJP

Clifford J. Proud, 

Magistrate Judge.

O R D E R

 Illinois inmate Calvin Pickett filed suit under 42 U.S.C. § 1983, claiming

that his Eighth Amendment rights were violated when he was denied adequate

medical care after a fall in his cell. He named 11 defendants who to varying

degrees were responsible for his treatment. The district court dismissed two of the

defendants and granted summary judgment to the rest. Pickett now appeals the

grant of summary judgment to four of the defendants: the prison warden, two

assistant wardens, and the guard who responded to Pickett’s call for aid on the

night he was injured. We affirm the judgment of the district court.

UNPUBLISHED ORDER

Not to be cited per Circuit Rule 53
No. 04-2271 Page 2

 The defendants, for the most part, do not remember but do not dispute the

facts Pickett alleges. In August 1998, while incarcerated at Shawnee Correctional

Center, Pickett slipped on the cell floor and reinjured his right knee. Pickett’s calls

for help were answered by prison guard and defendant David Nance, who promised

to call for a nurse. Thirty minutes later, a nurse arrived on the floor but did not

stop at Pickett’s cell, so he and his cellmate summoned Nance again. Nance soon

returned and told Pickett that he had called the nurse, which was all that he could

do, and that he was busy because he was “running showers” while the prison was on

lockdown. Thereafter, Nance ignored Pickett’s calls. A few hours later another

guard arranged for someone to take Pickett in a wheelchair to the Health Care Unit

to be examined. According to Pickett, this second guard also “agreed” that Nance

should have seen to it that he received help earlier. 

 The nurse who saw Pickett at the Health Care Unit that night gave him an

Ace bandage, ice, and pain medication, and told him that he would be able to see a

doctor in a few days. She also told him that his knee would be x-rayed. However,

when he saw a doctor three days later, the doctor determined that an x-ray was

unnecessary and refused to authorize one. In October 1998 he was examined by an

orthopedic consultant, who recommended an MRI scan for his right knee. The

prison medical director approved the recommendation, but the procedure was

disallowed by the company that subcontracted diagnostic services for the prison. 

 Dissatisfied with his treatment, Pickett filed grievances and complained

personally to the wardens that prison medical staff had inappropriately denied him

the x-ray and MRI, and several times they had refused to examine him, explain

their diagnoses, or provide more pain medication when he needed it. He also

claimed that they exacerbated his injury by refusing to accommodate him with a

cane, crutches, or a wheelchair, and that other staff members had unreasonably

denied his requests to be moved to a lower bunk or to housing closer to the dining

hall. Pickett states that the wardens promised to look into some of these things,

but ultimately did nothing but refer him back to the medical staff. Moreover, he

alleged that the wardens’ own actions exhibited a deliberate disregard for his

suffering and the risk of further injury. On one occasion, two of them stood

watching him “hobble” back to housing from the infirmary but did nothing to assist. 

And one of them—Pickett does not know which— ordered him placed in segregation

for nine days for refusing to leave the Health Care Unit after his appointment was

cancelled and the doctor refused to see him or to give him more pain medication. 

 In December 1998 Pickett finally received his x-ray, which showed that he

had scoliosis of the lumbar spine. He sought unsuccessfully to persuade the

wardens that he needed hospitalization. Then in April 1999 Pickett was

transferred to East Moline Correctional Center, where he eventually had an MRI

that indicated a strain in his anterior cruciate ligament and a possible tear in his
No. 04-2271 Page 3

medial meniscus. 

 Pickett brought his original suit in June 2000 and later amended his

complaint to include the current appellees and two other parties as additional

defendants. He alleged that the three wardens and the prison guard were

deliberately indifferent to his medical needs because they failed to provide him with

adequate medical attention. In April 2004 the district court granted summary

judgment to these defendants, explaining that Pickett had no right to a particular

course of treatment and that the defendants acted reasonably under the

circumstances.

 On appeal, Pickett asserts essentially the same arguments he raised in the

district court. The test for an Eighth Amendment claim in denial-of-medical-care

cases such as this one is whether the defendant has shown “deliberate indifference

to a prisoner’s serious illness or injury.” Estelle v. Gamble, 429 U.S. 97, 105 (1976);

see Gil v. Reed, 381 F.3d 649, 661 (7th Cir. 2004). The defendants do not dispute

that Pickett had a serious injury, so we focus on the deliberate indifference part of

the test. A prison official is deliberately indifferent if he is aware that an inmate is

facing a substantial risk of harm and fails to take reasonable steps to prevent it. 

Farmer v. Brennan, 511 U.S. 825, 847 (1994); Velez v. Johnson, 395 F.3d 732, 735

(7th Cir. 2005).

 Pickett cannot show that any of the four defendants acted unreasonably. See

Farmer, 511 U.S. at 845 (“prison officials who act reasonably cannot be found liable”

for violating the Eighth Amendment); Peate v. McCann, 294 F.3d 879, 882 (7th Cir.

2002). Pickett asserts that Nance “interfered and/or hindered prompt medical

attention,” but he points to no evidence in support of this claim. The facts in the

record do not even support an inference that Nance facilitated excessive delay. 

Delaying an inmate’s access to medical care may establish deliberate indifference,

see Estelle, 429 U.S. at 105-06; Gil, 381 F.3d at 662, but Pickett’s own testimony

suggests that Nance alerted medical staff soon after being summoned. And before

he began to ignore Pickett’s pleas, Nance responded twice with explanations and

assurances.

 A delay must cause harm to give rise to liability. Langston v. Peters, 100

F.3d 1235, 1240 (7th Cir. 1996). Pickett contends neither that his pain was

intolerable, nor that the delay caused an appreciable worsening of his condition. 

And in any case, we would require some kind of substantiation of such claims. Id. 

Moreover, Nance acted reasonably because he was entitled to rely on the prison

medical staff to establish and manage priorities in dispensing care. See Perkins v.

Lawson, 312 F.3d 872, 875 (7th Cir. 2002); Estate of Cole by Pardue v. Fromm, 94

F.3d 254, 262 (7th Cir. 1996). 
No. 04-2271 Page 4

 For similar reasons, we uphold the judgment of the district court as to the

three wardens. To the extent Pickett means to challenge the district court’s holding

that there is no vicarious liability under § 1983, his argument is a non-starter. 

Perkins, 312 F.3d at 875. But even if he is understood to suggest that the wardens

are liable because the violation of his rights was obvious and they did nothing—a

question the district court did not directly address—he must lose. This case is

distinguishable from those in which we have held communications from an inmate

adequate to put administrators on notice of violations, see Reed v. McBride, 178

F.3d 849, 854 (7th Cir. 1999); Vance v. Peters, 97 F.3d 987, 993 (7th Cir. 1996),

because all of Pickett’s alleged violations, including those involving decisions

formally in the hands of non-medical authorities, were premised on medical

judgments. Prison administrators may rely on medical staff except where it is

obvious that the staff is failing to exercise its medical judgment. See Spruill v.

Gillis, 372 F.3d 218, 236 (3d Cir. 2004). No such failure is obvious here. Therefore,

the wardens’ refusal to take “corrective actions” in response to Pickett’s complaints

was reasonable as a matter of law. See Cuoco v. Moritsugu, 222 F.3d 99, 111 (2d

Cir. 2000).

 The decision of the district court is AFFIRMED.